Question: When will Paul-Henri Spaak no longer be the secretary general of the North Atlantic Treaty Organization?
Paraphrase: What date will the secretary general of the North Atlantic Treaty Organization no longer be Paul-Henri Spaak?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q7184 p:P3975 ?s . ?s ps:P3975 wd:Q155691 . ?s pq:P582 ?value}